Rescue workers search for victims at the Pemex headquarters in Mexico City on Thursday.
-- A deadly blast that killed at least 37
people at the headquarters of Mexico's state-run oil giant was caused by
a buildup of gas in the basement, an official said Monday.
Mexican Attorney General Jesus Murillo Karam told reporters that no traces of explosives were found at the scene.
"The cause is clear; it's a gas explosion," he said, adding that the gas in question is believed to be methane.
The exact source of the gas remains unclear. Investigations are ongoing, Murillo said.
Dozens killed in Mexico office blast
Office explosion rocks Mexico City
Blast rocks Pemex tower in Mexico City
At least 37 people were
killed and more than 100 injured in the blast, which took place Thursday
at an administrative building in the Pemex office complex in Mexico
City.
Pemex is Mexico's powerful and much-criticized state oil monopoly.
Of those injured, at least 28 remained hospitalized Monday night, according to the health ministry.
Thousands of people work
at the company's headquarters, which includes a 54-story building that
is nearly 700 feet tall. The annex where the explosion happened is
adjacent to the tower.
Employees at the annex
said that the basement of the building, where the explosion originated,
housed a water treatment facility, storage areas and archives. The first
floor, which also was heavily damaged, is where the company's human
resources team worked.
A makeshift memorial for
the victims has sprung up outside the complex, where handwritten notes,
flowers and candles line a fence.
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